* What is Lua?
Lua is a simple, yet powerful, language for extending applications.
Lua has been developed by TeCGraf, the Computer Graphics Technology Group
of PUC-Rio, the Pontifical Catholic University of Rio de Janeiro, Brazil.
Dozens of industrial products developed by TeCGraf use Lua.

* Changes since version 2.5 (no versions between 2.5 and 3.0)
+ NEW CONCEPT: "tag methods".
Tag methods replace fallbacks as the meta-mechanism for extending the
semantics of Lua. Whereas fallbacks had a global nature, tag methods
work on objects having the same tag (e.g., groups of tables).
Existing code that uses fallbacks should work without change.
+ new, general syntax for constructors {[exp] = exp, ... }.
+ support for handling variable number of arguments in functions (varargs).
+ support for conditional compilation ($if ... $else ... $end).
+ cleaner semantics in API simplifies host code.
+ better support for writing libraries (auxlib.h).
+ better type checking and error messages in the standard library.
+ luac can now also undump.

* Legal matters
Lua is freely available for both academic and commercial purposes.

* Contacting the authors
Send your comments, bug reports and anything else to lua@tecgraf.puc-rio.br.
Please send us email if you download Lua so that we can know how far it goes.
For reporting bugs, try also the mailing list: lua-l@tecgraf.puc-rio.br